learn to shoot in low speed mode

This street lamp is familiar to those in this city,colorful lights every night accompany motorists who pass through the streets, just to accompany or even make motorists enjoy the beauty of city streets filled with lights,I myself enjoy the beautiful scenery.
That night I tried to photograph the scenery on the street,but people passing by on the street are a bit quiet, maybe because I went there in the middle of the night so it looks a bit lonely,only a few vehicles crossed that road,maybe I should go back there at a more convenient time when road users are still busy.

I took this picture using the low speed setting on the Sony A7300 camera by relying on a 16mm Sigma lens,I'm just learning the low speed setting, so I want to try the setting tonight,please give advice from friends for me so that I can maximize the results of my drawings.